Stove-pipe damper



(Model.)

0. D. BOSWORTH & J. F. POSTER. STOVE PIPE DAMPER.

No. 406,022. Patented July 2, 1889.

UNITED STATES PATENT OFFICE.

CLARK D. BOSIVORTH AND JAMES F. FOSTER, OF BUFFALO, NEW YORK.

STOVE-PIPE DAMPER.

SlPIECIFICA'IION forming part of Letters .Patent No. 406,022, dated July 2, 1889.

Application filed June 28, 1888. Serial No. 278,389. (Model) To aZZ whom it 11mg concern:

Be it known that we, CLARK D. BOSWORTH and JAMEs F. FOSTER, both citizens of the United States, residing at Buffalo, in the county of Erie and State of New York, have invented certain new and useful Improvements in Stove-Pipe Dampers; and we do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

This invention relates to dampers held in stove-pipes at one side only by tension against the sides of the pipe, the object being to simplify the construction of such dampers, doing away with springs or other extra appliances; and the invention consists in the means employed to hold the damper in position, and will be understood by reference to the following specification and claim.

In the drawings, Figure 1 a top plan of the damper in position, the stove-pipe in cross-section; Fig. 2, a side elevation, the damper-disk in section; Fig. 3, an elevation of the damper-spindle removed to show the slots in the shank; Fig. i, a transverse section through Fig. 2, partly in section, showing the end of the wedge turned down at one end.

A represents the damper-disk, having the usual air-openings c e and upper and under spindledoops c c. In addition the damper-plate is cast with a flat depression 0' immediately under and running in a direction at right augles to a spindle B, said spindle projecting over and beyond this depression 0, and having a slot (1 on each side, as shown, the edges of which nearly coincide with the edges of the depression 0', as shown in Fig. 2. Through this slot (Z, and resting in the depression a, is thrust a thin flat metal wedge D, made wider at its head than the slot (Z, in which it is forced, and tapering to its end.

1) is the single end socket forming part of the periphery of the disk and widened at its contact-point with the stove-pipe (I. The handle B of the spindle, at its cont-act part with the outside of the stove-pipe C, is also widened, as shown. The stove-pipe setting between. these wide flat surfaces gives a good bearing area at both the inside and outside points of contact with the stove-pipe when the pressure for the purpose of sustaining the damper is exerted.

\Vhen the damper-plate is set in the stove pipe and, the spindle inserted through the hole in the pipe made for that purpose and the spindle-loops c c, the Wedge 1), following the depression 0, is forced into the slot (Z, and by reason of its form produces a pressure against both sides of the pipe 0 by forcing the two surfaeesB and 1) against it, sustain ing the damper in a horizontal position and allowing it to be moved in the pipe as desired for regulating the draft. The holes a c are in such a position that the ends of the wedge I) will project over the holes, so that one or both ends may be bent down through the holes in such a manner as to hook the wedge in place therein, holding it securely in position. and preventing its loosening or any withdrawal of pressure at B b in consequence. Having two slots (Z (l in the spindle is merely to save trouble in setting the spindie in the damper the right side down.

The combination of the disk A, having an end socket Z), holes c c, and a depression 0', the spindle l3, having the wide bearing B and slots (Z d, and the tapering key or wedge D, adapted to set in depression 0' and in slot- (1, the end or ends of said wedge bent down through holes 6 c in the damper to lock it in place, as specified.

I11 testimony whereof we affix our signatures in presence of two witnesses.

CLARK D. BOSWORTH. JAMES F. FOSTER.

\Vitnesses:

J. R. DRAKE, GEO. B. BURNETT. 

